Laetiporus sp. 2

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Laetiporus montanus

Basidiocarps annual, laterally substipitate to sessile, usually imbricate often in large clusters, rarely single; pileus dimidiate to flabelliform, up to 34 cm long, 20 cm wide, upper surface light orange to reddish orange when fresh, fading to pale brownish with age or drying, glabrous, azonate to faintly zonate, radiately furrowed; pore surface yellow when fresh, fading to pale tan on drying, pores nearly circular at first, becoming more angular in age, 2-4 per mm, with thin dissepiments that quickly become lacerate; tube layer lemon yellow when fresh, drying pale buff, up to 1.5 mm thick; context white to yellowish white, azonate, brittle and sappy or succulent when fresh, up to 1.8 cm thick, rapidly becoming crumbly, chalky and white in old deteriorating specimens; taste mild, odor fruity, pleasant. Hyphal system dimitic; contextual generative hyphae thin-walled, hyaline, simple-septate, with rare branching, 5.6-14 µm in diam.; contextual binding hyphae firm- to thick-walled, hyaline, nonseptate, much branched and interlocking, up to 20 µm in diam; tramal generative hyphae thin-walled, hyaline simple-septate, 2.4-4 µm diam.; tramal skeletal hyphae thick- to firm-walled, 2.0-3.6 µm in diam. Cystidia or other sterile hymenial elements lacking. Basidia clavate, 2-4 sterigmate, 14-33 × 5-10 µm, simple-septate at the base. Basidiospores ovoid to ellipsoid, hyaline, smooth, IKI-, CB-, 6.0-8.0(-8.4) × (4.0-)4.1-5.1(-5.5) µm, L = 7.1 µm, W = 4.6 µm, r = 1.54, R = 1.33-1.75

  • Substrata: conifers, mainly Abies spp. and Picea spp., occurring on dead logs or stumps.
  • Distribution: in the boreal to cool temperate areas in Europa, Japan, Mongolia and China.
  • Type of decay: brown rot, heart rot
  • DNA sequences (nuclear ribosomal DNA of ITS1, 5.8S and ITS2): AB308184[[1]], AB308185[[2]], AB308186[[3]], AB308187[[4]], AB308188[[5]], AB308189[[6]], AB308194[[7]], AB308195[[8]], AB308196[[9]]
  • DNA sequences (elongation factor 1 α region partial): AB308258[[10]], AB308259[[11]], AB308260[[12]], AB308261[[13]], AB308262[[14]], AB308266[[15]], AB308267[[16]]


Laetiporus montanus

子実体は1年生、無柄あるいは側生の短い柄を持つ。通常複数の傘が重なり合って発生する。大きな株となる場合もあるが、数枚の傘で発生する場合や単生する場合もある。は扇型から貝殻型、長さ34cm幅20cm、傘の表面は新鮮時は鮮やかなオレンジ色から赤みを帯びたオレンジ色、のちに色あせて淡褐色になる。放射状に波打つ。不明瞭な環紋がある。子実層托は菅孔状、鮮やかな黄色、孔口は円形のちにやや角型、2-4個/mm。菅孔は新鮮時はレモン色、古くなると淡黄褐色、長さ1.5mm程度。傘肉は類白色から淡黄白色、厚さ2cm程度、新鮮時は多湿柔軟でもろい肉質、古くなり乾燥するともろく砕けやすくなる。フルーティーな香りをもつ。 子実体組織の菌糸型は2菌糸型:傘肉の原菌糸は無色、薄壁、クランプをもたない、ほとんど分岐しない、径5.6-14µm。結合菌糸は厚壁、無色、隔壁はなく、頻繁に分岐し結合する。径20 µm以下。実質組織の原菌糸は薄壁、無色、クランプを欠く、径2.4-4µm。骨格菌糸は厚壁、無色、径2.0-3.6µm。担子器は2-4小柄、大きさ15-20 × 5-8 µm、基部にクランプを欠く、担子胞子は楕円形~卵形、無色、平滑、IKI-, CB-,6.0-8.0(-8.4) × (4.0-)4.1-5.1(-5.5) µm, L = 7.1 µm, W = 4.6 µm, r = 1.54, R = 1.33-1.75。

  • 基質および宿主:針葉樹。切株、倒木、枯死木。
  • 分布:冷温帯から亜寒帯地域。ヨーロッパ、日本、中国、モンゴル。
  • 腐朽型・腐朽部位:褐色腐朽、心材腐朽